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        <h3>Important</h3>
        <p>
            This is the development version of <em>The Swift Programming Language</em> book.
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        <p>
            For the current shipping book, see <a href="https://docs.swift.org/swift-book/documentation/the-swift-programming-language/">Swift.org</a>.
            To contribute to this documentation, see the <a href="https://github.com/swiftlang/swift-book">swift-book project</a> on GitHub.
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